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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111a7dd21c904b9540c8769c4490ca63d05fba795dab56b55eea6717d7238ae' 
  AND token = '/vWVxjnfe7dUZQZv2M2nUsnI+ZyC4naNNcgakWDsrLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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