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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d21fb34d0b605d7cf480722d3d96d693a9e66f12a2694d52e57a9d842e248a' 
  AND token = 'HvrXNOA0B9i6YTvLhoPBRJ30XM2UHlkHTLDnw0SVhc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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