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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa3fcfbe4180a21c5a9e103485706af43e2138f878c8b07942d1b8523d22a0d' 
  AND token = '3m4C5jdQVpFxaxx8h7+OL+u/yoAIGb7gLh04t2CAVLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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