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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62ad8b14a39214c6ea89c9d798f5754b28b81265c3cc532200fe7526009d3dd' 
  AND token = 'ckgsB/TCKUCcWxmBLPV4aLxq/2wLfSOOJ4jsa41uibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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