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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2322a2cc976b5cef186d34206b8a2716fda04d7a3a85db03caa79ec1549c0338' 
  AND token = 'EzCAm4YyEU+R6S7BAFI/VnUNzaeUTEaAxEiveUtpemU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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