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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435310d05d97a11aa85628d02ba12746aa3075ea8a2b1b3c841e3ffad5ee31fc' 
  AND token = 'HBqrhgK7DKizjftA8hpC8OnKekk9qHupM7W/gBXKrjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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