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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de884d9d8d2e517248a605f94bf600eda29e03ff1c22d1f103ee10f6e4cb742f' 
  AND token = 'o7CeCm/F1RQbeAG3OAX+CcXlndkkJ2j7/iZVHmN+omE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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