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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00105192c1479f41a637f7bb754bc21137190079905bf8be50b7e8258d5aed5' 
  AND token = 'UNl2jrlkBFAlU3K/NjX8FA4zQfPPIUlzawA8SZIT5pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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