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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dce4c4386485b8ad833f571ba8504df47e3056047bcf2172161bebb05f1cf09' 
  AND token = 'HoURELK8GJH3qckOE3jltjNcUr+C1+Nq6MBevSTCF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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