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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af9b0da49c408b57a1641f2c481ab83d997a91c2d29f71a95993766b5a8d0b2' 
  AND token = 'ge6zgDuOZ5TCOwofOsWZh5Ognin4m1woRpxsFBswpwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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