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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9350ccc78edd46ec1b49181c6c177a64e8d1ea5d0a918ed3d2bbdc783b3fc232' 
  AND token = 'DfWOf1r0G4UhTcn1UuBSLENa2SUsSIp4BVH8Gm4mdNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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