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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e814c3f4e1a4456f7f5a25eaa128862ac52fbee59483dfdba97e3107c132ff' 
  AND token = 'M01gICVAolsUXEXnPwUDozH1+tYiK3xOMN6CzR4TCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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