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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a395a13f3c942b505c4b83f8767c8c0680f3eeba153fa7249aa8c51ede61a3b5' 
  AND token = 'Hd5ybV1/dgN8hVxLfxsKtT49Xb0+4n2hjsneCEMFanM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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