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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a0996dafa17dadcb5bad14b7188d14049aaf0ce17787911e7b8a5666419c99' 
  AND token = 'Ua38cUYazdLmyg1YH34us6Is76d9c7k+CVQq2/+Q+TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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