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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa64bdc6ccc69b29ca7e0d5f5e1efb3c425a1caa776fe1cce4f7b7acb972c25' 
  AND token = 't/EDGs+d9Xr/D1ntOhSy2gebZ+IvhtTXKbtFjFH5eWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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