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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c70e2fac01bbc9903e1d29c4237c2433364ef45be41409d6f07b24e1b48c26a' 
  AND token = 'YBVExIoDFJnGxYL4kVy1N2FtCUmEkKlQ9ffqiroMOMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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