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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e77d0be1555aa49c4323c2f230b7ae90a45642baec62bac4f3100932880961b' 
  AND token = 'oP5MJzbvPMno7nYuqF+48NyifFd5z0aolhqx1ZhS9nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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