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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485d567b33690b649a0f079079fabd54acdfbc4a5c1cd6f90e77b0611ba5b19b' 
  AND token = 'DzBCp0ai8h2vbxcmE4jbGKQl45P5TqNiF9Zb4YmeuKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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