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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad32d4757891710d2d4770ae67787b157cc11c18c4756698d084ca98efa5d70' 
  AND token = 'wbFSVqf5E5UhSCefOeY6VUv3LBo/Wy+dZxNLUaX6ROg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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