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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaffb2bdc98e9d5f481389e241e3625283c50d8aee6870227ca09652cf06c3d' 
  AND token = '89JaNQicYvq4Ws3laKmF+HxXlZ9ZMSfg236zOPJFm78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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