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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f077429af1a66469288010417157e1e493d26931935e8c36396397ba6f7ff7' 
  AND token = '5vFXa9l4ydOwfdnYmkYsejIAfuK+Hhj/Dyycx61b+Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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