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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d4897120530683dbb23166b85f5c5055990e784d4fd957ed7a875cc0d6903f' 
  AND token = '+rHPyJdooOF92/UGr7umRmqWSzd4LFNMc1LZOoblBB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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