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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2a1f96b79aa418e310f8bf1f3d0f5568f7afef04ea23ef337fa7e1bfca7177' 
  AND token = '9cFu59wz8QoWNUoSFZSJmsFPkGXWdq1AjcfT5pbbCsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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