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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b94b38cba10de126caf2d08bddc959fc47d668e76995e5bf1f50991779f889c' 
  AND token = '0f+edL3V6SuBbiEfrIozo9soGD4ZsNrOk5sNXZ2xWUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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