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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2de01e8c5150256c597cdd2ca8d3d5241de1db4ab15453f2a8e8b3b12db94cf' 
  AND token = 'RHQxvDe+r0kBN3XhcAxpL4wnV+4QrknIKw5nfA6dPOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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