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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad7d003fd47a6adf26b1a3ef6657aa6375a7aaadd12e0f46187bc5b405a4c73' 
  AND token = 'Y+9R5TaQPq0iVQhRZfQlGwlLjdsLjhiAR1YAtbhpf6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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