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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd77244d058d2b35e628917b5ae699b9643b34482f5a183fdc1fd81c726f0fb0' 
  AND token = 'q3/rC8Y/bUWquXSPLh1+GENeSddpIla57ZI+H3a1SnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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