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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a60fd78ba0d31d7a5b2a037d75ad0092665333af604b581c58acef492e0a98' 
  AND token = 'XPPeGzugKrM/Of7YyFuGs9hYcm/NDNetRwSCFYm3xac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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