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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec9c506812d2f53077a7d9295a92252c4c5e66341263cb6c463820033d24390' 
  AND token = 'Y0eWadEiho8SYkDN3YwZy5cbuzkOfEjLnUIFqs28FFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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