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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6529974370c32fa74eed7f9043a41c30fba852f2a7cfdeeb6c80dd75c35040' 
  AND token = 'pq+tbF4/w2iTwzI6cw9vipQOCcp3E9DSK/+MK6B/8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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