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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ae787026ae51d153dee712e13b60688169fd4d0761af662a664761375d3e80' 
  AND token = 'c0rI1KHIlWjqQ/wbWQEJ8yAH1q9TAhZnA2tCE/C4ZpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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