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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cdb93a2ffb318b581d14e54e7fa9d540ddde1c436b54bb0c7486b5475775de' 
  AND token = 'Lvc94/S5AoGi8+7Uuv5YDaS+itICYrwGSBT/V5DO2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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