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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe4a65319282969b2a895ea28e12b6ff3f56463920c22db11d7e9fbcf31726f' 
  AND token = '8eCfIQt8mb8I81C4KaQ9G6eTM44JgB4ljA56nwk4bfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}