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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4696aec1ec6cda3428063a9be371fbef68a8b8a0923352b4641a82fa296b76c' 
  AND token = 'DQzPynd+9SRTGt5/YMwy7T/BOl3OZlnzeKtNsqEExHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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