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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6f4c24c374eb14b2c97eed05451378e02ae471d639368f71c6e5661c5ce993' 
  AND token = 'G2uQxcyD14gpoLK0irsfzt7zDRlpx1itF5ZeyoIas4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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