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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc86a22ca0d32b714125dbefcef9f256ba5794d2a0e7dc88f14a60770a07b3c8' 
  AND token = 'E/SxV2K/ZljsAiWn4MZ/XVaOAo0yoHWHZqwwKxc7J7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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