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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e183f1aea73ed8952a384eba9440eb8b82fcaeb833006b6bf0eefb1dca708a4c' 
  AND token = 'EQZRX+D+HXjH8nn67g7wO6TdUSsugA1rPWuGmkUr6Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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