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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89c0bb8dccfa5c7df2d99f04a4d7a5190a40ea9d38a1d1c09edd0ffd2a995df' 
  AND token = 'hwAIDGmnZAP24RJui2QHnIBBl4V6CjuLEZopjhqxNI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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