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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53e46e1eb6fa856b17a09afa6de3f2a3bb9e5b3919bbc39dee192c697d3a7e9' 
  AND token = 'AiuL9892Z6ZPHrf7SlSMYozGFB6GUrqb8omaPeNMI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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