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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b0a8cc72cc0fdab2e04d125ca5cffb64782435f3e1bc044a2a207b59413246' 
  AND token = 'rZtWqSV4e1dSn/AHHBiqjMBkkPo2aeFzZGpYv06oALk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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