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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4eb02d601b28df36d3aa668c077147b65766a8665608b8696345c24339474c' 
  AND token = '5Wv2pe4gy02xkv1cOaAuA8bGilhYLBkQ0N3Fvf0nUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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