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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddf86a88e7a48c3d51f66a38892b45a643d59878c258f290175d5985dd1f9e7' 
  AND token = 'Jj8rgBkrcCfLhj+p6OusYJWMZx4SpsUc55aIIuYEZ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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