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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648bf496bd927bb8bdb38c06d70756513bc78c2bbfe3d2e29ebee7a168f12bde' 
  AND token = '9EmpAj2HxozgpCjZ0V+AexJvh0lAu30phdCUvzeoByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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