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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ff802c69b00055ec2c96333008a8bee98265dae5948671b9d73a9ff68ba9d0' 
  AND token = '9JYIddZETlTiwMfJ+6rtypm2eS+Ax/X2MAtNPH+RBeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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