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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6cad30d1737aad0217cde691730c8bed3550761eeb626e800b02c4ab2e1e69' 
  AND token = 'XtWoOJ8sl7dvQoMCdZhU+qp74Ht6+G+HE1Wjpmu5E+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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