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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13e578df14715272b561384dad738f06ceb791bfde28897a3802f06c22d4b2b' 
  AND token = 'PRgiWRimYZL3JyvkNanf8bwpxPTpJPmSyih1yLJgYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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