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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7867f8e2fead71c726092c01d7f498e1efb30b490d2cbab7a1314a4db513dfc1' 
  AND token = 'V+He1zmyzlTvQdrrcSwn4MP5mb7MXkJfv4yfDAiD3s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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