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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667a3faf2f17f6a72c7cae5f70b3e945ea00678733b1334c5050ce34f10fbc88' 
  AND token = 'bwn1eGDGwGiVMwWh+gpVhI1Dh/1zWREBXEICikT96ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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