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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04b811ffe59a07806464885ba0bda5b1ffab0365f72a91e56ce9b9010a284b0' 
  AND token = 'YaCHRmV4dwf+9l0p9k8yrv+2XG5eol2utCZyL/ChHls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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