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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af81d2a8b932611c204506416bcd5dab6f8703ebdcbd7df922d2c4917c0069aa' 
  AND token = 'mJLkyTcEqcBrSEOekwztXxP9D/zvaqe16Q89pJ48vO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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