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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ce99ef82ca320798c5a4c7dcb77fdeb59f458e89e85fcf8fa268e91b941f41' 
  AND token = 'bKvv7wfyTcgcDAojkQmPLOF04KhGE/+P7YZurV9wWeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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