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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70cf6598be5b45bb4d8c4307738baf5301076ba00c6b2eaa4f3f550c73ec9ee' 
  AND token = 'e7TaCfZNPYTY6+wR6r5XT1uEKyga2EM2hiKLglg9RvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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