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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956d71f0c95c0e447e6691aea33baa1eaf81377b9c4f025749b8f0ba908bffa2' 
  AND token = 'EwBDvahNvOf0avleT5EpU1uG72B57/Vlk2Tcmfg4qtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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