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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3064c4430612adc78cc0fbd4d12fbbb29b6fafe6c72fc4321ba6a11dc23e5a' 
  AND token = 'NUh0ufytv8QZ8cfW9VmFs2WjVp7nICLPIAMDGZHJzuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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