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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afe24f361451aa51ba1a6c9f3d93a5ce30844f59bfbf7e2a209e5afe4b46e1d' 
  AND token = '+NTKA01D1d1vbQiJB7nxg/mROrfJS5+N0SVrS2seQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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