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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16d6e7f389dedd4e0515c9fd78006402e08b85781e648d39924710f2050aac1' 
  AND token = 'xIRKods/xdySpnvFjk2joiJ9qszQQsAybFsoFMgMRb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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